Top five non-religious books on living a good life

One title on A.C. Grayling's top 5 list of non-religious books on living a good life:Edward Gibbon, The Decline and Fall of the Roman Empire, 1776-1789Although the whole of this gripping and majestic work is too much for most people in our hasty and hurried age, the (in)famous and important chapters 15 and 16 are an instructive read, for whose sake the whole is worth having. But the whole is